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Title: Ultrasonic Meter Diagnostics And Condition Monitoring
Author: James W. Bowen
Source: American Gas Association 2001
Year Published: 2001
Abstract: Ultrasonic meters offer unprecedented accuracy, repeatability and reliability for natural gas measurement in the correct application. These devices have unique outputs that enable remote condition monitoring. Integrating these diagnostic outputs and setting reasonable alarm limits is, however, ill defined and most manufacturers, including Instromet, have suggested that relative, or baseline comparisons be employed to alert operators to a change in the meters operating state. But what parameter comparisons should be made? What levels of change in these parameters should be considered significant, and what remedial actions do their variance imply? Following is and explanation of what these outputs mean and suggested guidelines for establishing these limits. The information presented here is based on the authors current knowledge, culled from personal experience and the operational experiences of others. This information is by no means exhaustive since operators and manufacturers alike continue to learn more about gas ultrasonic meter application in field operating environments daily. Naturally, the parameters suggested for monitoring and their interpretation are specific to Instromet ultrasonic meters, but the general approach to monitoring operational performance is similar for most gas ultrasonic meters.

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